Java Cryptography Extension (JCE)
The Java Cryptography Extension (JCE) provides a framework and implementations for encryption, key generation and key agreement, and Message Authentication Code (MAC) algorithms.
Java Runtime Environment (JRE)
The JRE is a subset of the JDK for end-users. It includes a Java Virtual Machine and a Java interpreter and provides a unified interface to Java programs, regardless of the underlying operating system.
Java Server Pages (JSP)
A Java technology that helps software developers serve dynamically generated web pages based on HTML, XML, or other document types.
Java Software Development Kit (JDK)
The JDK (previously called the Java SDK) is the software development environment for writing Java applets or applications; it is a superset of the Java Runtime Environment and the Java Virtual Machine.
Java Virtual Machine (JVM or VM)
The JVM is the part of Java that interprets Java bytecode. Because the JVM is part of the JDK, it has the same version number. When a browser supports a specific version of the JDK, this includes the JVM.